Identification of Li-Ion Battery SEI Compounds through 7Li and 13C Solid-State MAS NMR Spectroscopy and MALDI-TOF Mass Spectrometry

Laura A. Huff, Hadi Tavassol, Jennifer L. Esbenshade, Wenting Xing, Yet Ming Chiang, Andrew A. Gewirth

Research output: Contribution to journalArticle

Abstract

Solid-state 7Li and 13C MAS NMR spectra of cycled graphitic Li-ion anodes demonstrate SEI compound formation upon lithiation that is followed by changes in the SEI upon delithiation. Solid-state 13C DPMAS NMR shows changes in peaks associated with organic solvent compounds (ethylene carbonate and dimethyl carbonate, EC/DMC) upon electrochemical cycling due to the formation of and subsequent changes in the SEI compounds. Solid-state 13C NMR spin-lattice (T1) relaxation time measurements of lithiated Li-ion anodes and reference poly(ethylene oxide) (PEO) powders, along with MALDI-TOF mass spectrometry results, indicate that large-molecular-weight polymers are formed in the SEI layers of the discharged anodes. MALDI-TOF MS and NMR spectroscopy results additionally indicate that delithiated anodes exhibit a larger number of SEI products than is found in lithiated anodes.

Original languageEnglish (US)
Pages (from-to)371-380
Number of pages10
JournalACS Applied Materials and Interfaces
Volume8
Issue number1
DOIs
StatePublished - Jan 13 2016

    Fingerprint

Keywords

  • Li-ion battery
  • MALDI TOF MS
  • NMR
  • SEI
  • graphite anode

ASJC Scopus subject areas

  • Materials Science(all)

Cite this